I had the slow window problems on both sides awhile back. My driver's side window motor completely quit working and now that I have replaced it, cleaned, and lubed all of the tacks the window roles up almost as fast as my newer vehicles. All this to say, the problem I had was more a 30 year old weak window motor and less about how much power I had going to the motor. Thought I would throw that out there just in case you do not get the results you are looking for. FWIW I will be saving this thread so I can make the same changes in the future.